Pneumatic drill jack



Jan. 8, 1957 w.:H. EATON 2,776,653

PNEUMATIC DRILL JACK Filed June 17, 1954 INVENTOR Waynefgczfon ATT("RNEY United States Patent O PNEUMATIC DRILL JACK Wayne H. Eaton,Wakeeney, Kans.

Application June 17, 1954, Serial No. 437,531

1 Claim. (Cl. 125-33) This invention relates to pneumatic drills such asthose commonly used for drilling into concrete, asphalt, mac* adam, rockand earth. Such drills include a vertically elongated body havinglateral handles at its upper end by means of which a laborer supportsthe drill in operative position, lifts it at the end `of a drillingoperation and moves it for the next opera-tion.

The drills are necessarily very heavy and consequently `a great deal ofstrength must be expended each day in lifting them from the drilledholes. The present invention however is designed to provide 'a novelpneumatic jack `attached to the drill body and 1active at the will ofthe operator to lift the entire drill. A great deal of work is thusavoided, 'better time may be made on any job, and a man of unusualstrength and stamina is not required for operating the drill.

The jack is provided with a control valve which receives compressed airfrom Ithe usual compressed-airconducting means of the drill, and afurther object of the invention is Vto provide this valve with anoperating handle disposed adja-cent one of the drill handles to beactuated by 'the same hand which grips the latter.

A 'still further object of the invention is to provide a jack which willhave no tendency t-o tilt the drill and bind the bi-t in 'the drilledhole when the drill is being lifted from the hole. To this end, twopneumatic cylinder-and-piston assemblies are mounted on opposite sidesof the drill body and the lower ends of lthe piston rods are secured toa foot which engages the ground or the like during jack operation.

Yet another object is to provide Ithe foot in the form of a U whichpartially cir-cumscribes ythe lower end `of the drill body and due toits shape will not prevent the operator from seeing the 'bit whenstarting a hole.

A still further object is to provide a simple and inexpensive yet anetlicient and durable construction which may be expeditiouslymanufactured Iand profitably sold at a fair price.

With the above and other objects in view that will become apparent asthe nature of the invention is better understood, the same cons-ists inthe novel form, combination and arrangement of parts hereinafter morefully described, shown in the accompanying drawing and claimed.

in the drawing:

Fig. 1 is a conventionalized fron-t elevation, partly yin section,showing a pneumatic drill improved in accordance with 'the invention;`and Fig. 2 is a horizontal sectional View on line 2 2 of Fig. l.

A construction has been shown which will meet all requirements yand maybe considered as preferred. However, it is to be understood thatvariations may be made without depart-ing from the spi-rit and scope ofthe invention as claimed.

The vertically elongated body of the drill is shown 'at 3 and itslateral handles at 4. The drill bit is Ishown 'at 5 and ran operatinglever for the usual control valve is indicated at 6. At 7 the compressedair supply line is ICC shown connected to a nipple 8 on the body 3. Aslall of 'these elements are common, their illustration has beenconventionalized.

Two vertical cylinders 9 are disposed at opposite sides of the body 3 inparallel relation with `the axis thereof. These lcyl-inders haveattaching lugs secured by cap screws or Kthe like 11 `to the body 3, andlthe lower ends of said cylinders have piston rod guides 12 containingsuitable rod packing means 13. Pistons 14 in the cylinders 9 areprovided with rods 15 which extends through 4the guides 12 and packingmeans 13.

The lower ends of the rods 15 are -secured 'to a hori- Zontal foot 16 toengage the ground or the like when the jack is operated to lift thedrill. This foot 16 is of U-shape -as seen in Fig. 2 and it onlypartially circumscribes `the lower end of the body 3, leaving the frontunobstructed `to allow the drill operator to readily see 'the point ofthe bit 5 when starting each hole.

A control valve 17 is secured to the body 3 and is provided wit-h anoperating handle 18 adjacent one of the handles 4, to be operated by thesame hand which grips the latter. A compressed-air-supply line 19 isconnected to the nipple 8 and extends to the valve 17, and two saidpistons.

branched lines 20 and 21 extend from said valve 17. The branched line 20extends to the upper ends of the cylinders 9 and the branched line 21extend-s to the lower ends of said cylinders. Each line 20, 21 is bothan admission and an exhaust line, depending upon the position of thevalve handle 18.

During drill operation the foot 1'6 is in raised position as seen inFig. 1 and is so held by compressed air under lthe pistons 14. When ahole has been drilled to the required depth, the Ihandle 1S is operatedto admit compressed air over the pistons 14 and exhaust air from belowConsequently, the foot 16 will thrust downwardly upon the ground or thelike Iand the entire drill will be lifted with no effort on the part yofthe operator. Then the valve 17 is operated `to again raise the foot 17and lthe drill is ready for the next operation.

From the foregoing, it will be seen that a novel and advantageousconstruction has been disclosed for attaining the desired ends. However,attention is aga-in invited to the possibility of making variationswithin `the scope of the invention as claimed.

I claim:

An improvement in 'a pneumatic drill of the type having a verticallyelongated body, lateral handles at the upper end of said body, a drillbit projecting downwardly from said body, and compressed air-conductingmeans connected with said body; comprising 4a pair of pneumatic bodylifting jacks, said jacks comprising a pair of elongated cylinderssecured to said body and having their 4axes parallel with the axis ofthe body and 'at diametrically opposite sides of the body, la pist-onreciprocably d-isposed in each cylinder, a piston rod in each cylinderwith the respective piston secured `to `one end thereof and the`opposite end thereof projecting beyond the corresponding end of thecylinder, a surface engaging foot member connected `to said projectingpiston rod ends, a control valve in communication with said compressedair conducting means, a valve `operating handle |adjacent one of saidlateral handles, said foot member being substantially semicircular inplan and being disposed substantially wholly to one side of said bodyfor ground cont-act and out -of the normal line of vision of the drillbit.

References Cited in the le of this patent UNITED STATES PATENTS1,275,164 Gilman s- Aug. 6, 1918 2,579,533 Alger Dec. 25, 1951 2,622,562Longenecker Dee. 23, 1952 2,661,063 Owens Dec. 1, 1953

